Yep I did try and top Fiona. Did it at around 24 days, and she didnt grow the main cola back. Id have a go at doing it again if it was done at an earlier stage, but for a plant this small, youll only get a couple of grams extra (if it works...)
Oh and Id tie the bottom buds down when they start flowering with Lowryders, unless youve got a light thats above 600w. It really does make a lot of difference, and only takes 15 minutes and a bit of string.